Fuel burning space heater with draft control means



July 24, 1951 R17 5 MAYO 2,561,934

FUEL BURNING SPACE HEATER WITH DRAFT CONTROL MEANS Filed NOV. 26, 1945 2 Sheets-Sheet l y 1951 R. E. MAYO 2,561,934

FUEL BURNING SPACE HEATER wm-x DRAFT CONTROL MEANS Filed Nov. 26, 1945 2 Sheets-Sheet 2 i atented July 24,-" 195i UNITED STATES PATENT mcs FUEL BURNING SPACE HEATER WITH DRAFT CONTROL MEANS Reubin E. Mayo, Maury, 0.

Application November 26, 1945, Serial No. 630,753

Claims. (Cl. 126-93) A, This invention relates to improvements in space heaters, and more particularly to space heaters of the forced draft type.

One of the objects of the invention is to provide a forced draft space heater provided with controlling means so constructed and arranged 'that a portion of the forced air, after being heated,

and some of the hot products of combustion may I be discharged'directly into the compartment or compartments to be heated while the'other portion thereof is directed to the fuel of burner or burners to be mixed'with the fuel for combustion purposes.

With the foregoing object outlined and with other objects in view which will appear as the description proceeds, the invention consists in the novel features hereinafter described, in detail, il-

lustrated in the accompanying drawings, and more particularlypointed out in the appended claims.

In the drawings: Fig. 1 is a top plan view of one form of a space heater in accordance with the invention.

Fig. 2 is a vertical sectional view taken on the line 2-2 of Fig. Fig. 3is a view similar to Fig. 2 of the lower portion of a modification.

Fig. 4 is atop plan view of the damper shown in Figs. 2 and 3, partly closed.

. Fig. 5 is a sectional view on the line 5-5 of Fig. 4. I r

Fig. 6 is a top planview of another modification with the fan or blower removed.

Fig. 7 is a vertical sectional view on the line Fig. 8 is a sectional view of a modification of a detail of the structure shownin Fig. '7. I

Fig. 9 is a sectional view of asleeve. type damper shown in Fig, 7. 1

, Referring first to Figs. 1 and 2, H designates a vertically disposed casing, open at its lower end and provided with an external flange H or the like for attachment of threaded legs I3 having threaded engagement with the flange for adjusting the position of the casing relativelyto the surface 14 on which the heater is supported.

Centrally arranged in the 'casin is a downdraft tube I5 spaced from the inner surface-thereof to provide an annular chamber I6 "which'isclosed at its upper end by 'an'annular roof ll;

adjoining the upper edges of the casing andtube:

. Any suitable air blower, such as an electric motor-driven fan [8, is suitably supported at the top of the tube l5 for forcing air from the space 2 in which the heater is arranged, down the tube, from which it may be discharged through apertures [9, at the lower end portion of the tube into an auxiliary annular chamber or fire pot 20 having an upstanding annular wall 2| projecting from an annular bottom 22 rigidly united with the tube l5. The bottom 22 is preferably imperforate while the wall 2| is provided with apertures 23 to allow heated air to pass through the fire pot into an-annular' chamber 24 from which the heated air and some of the hot products of combustion may be discharged below the bottom edge of the casing I I into the room or space to be heated.

An annular internal roof 25 of the chamber 24, connects the upper end of the wall 2| to the casing II and the roof is apertured as indicated at 26 to allow hot products of combustion entering the chamber 24 to be discharged into the chamber IE, or, when theblower is inoperative, to permit air to flow upwardly through the chamberv 24 into the chamber [6. An annular baffle 21 is mounted on the roof above the apertures 26 to directgases toward the center oif the structure, and another bafiie 28 is mountedon thetube I5, above the baffle 27, to cause hot products ofvcombustion to be directed toward the wall of the casing II for heating the latter. I u The casing is preferably provided near its upper end witha discharge flue 29 fordelivering, prode nets of combustion to' achimney or the like, and if desired, the casing can be provided with a door30. a I a At the bottom-ofthe tube [5, there is arranged a stationary plate .3l provided .With relatively large apertu'restZ designed to cooperate with a similar rotatable plate 33 to ;form a regulating damper having a handle 34. The plate3l is ar ranged below a plurality of; fuel radiating tubes 35, the outer ends of which form burners discharging into the,fire pot 2D,;and these burners may be supplied with fuel by any suitable means. For example,tthe tubes .35 may be connected to;a pipe 36 receiving. .fueltoil from a tank'31 or the like :Y 4 I In operation it will be noted that oil discharged from the burners will-inix-ih; the fire pct 20 with 5 air entering the'same either through apertures 23 by natural draft or apertures H? by forced draft. When natural draftis used, the heated air will travel upwardly past the "'baflies"2l,"28; to heat the wan of 'the casin gandthen-be discharged; through'theflue29. "When forcedhraftis used, the air forced through the tube I5 will be preheated and some of it will travel through the holes in the damper at the bottom of the tube while the remainder will enter the fire pot through apertures IS. The air entering through l9 will mix with the fuel to form a combustible mixture. The products of combustion, in this instance, will pass upwardly past the baffles 21, 28 and be discharged through the flue 29, and in doing so, will heat the tube and the casing. A part of the heated air-and some of the products of combustion are discharged through the open lower end of the casing ll during forced draft resulting from the operation of the fan l8.

The modification shown in .Fig. 3 is similar to that in Fig. 1, with the exception that the wall 2m is imperforate so that no gas will pass there through.

In the modifications shown in Figs. 6 and 7,,

the structure is similar to that shown in Figs. 2 and 5, with the exception that the apertures I9a are positioned above the fire-box and the damper 32a is of the sleeved type instead of the ported plate variety. The damper 32 11. is shown more clearly in Fig. 9 and includes a sleeve 4| having radially disposed openings 42. A ring 43 cup-shaped fire pot having an impervious annular bottom wall and a generally cylindrical side wall provided with a plurality of spaced apertures, an annular flange joining the top of the cylindrical wall to said casing and supporting the fire pot within the lower end of the casing, a vertically disposed tube in said casing extending into the fire pot providing an annular space between the periphery of the tube and the cylindrical wall 'of the fire pot, said tube being secured to the bottom wall of the fire potya fan within'said tube for forcing air downwardly therein, :a, plate across the lower end of said tube having ports therehaving a plurality of apertures through the wall embraces the sleeve 41 and may be rotated thereon. The ring 43 is provided with openings 44 which are adapted to register with the openings 42. In this modification the fuel is fed to the firepot through a pipe 46 which communicates with the radially disposed tubes 35a.

Instead of arranging the bafile 28 horizontally,

as in Figs. 2, 3 and 7, it may be of dish-shape as indicated at 28a, in Fig. 8, with the periphery thereof arranged uppermost.

From the foregoing, it is believed that the conwithout departing from the spirit of the invention, as expressed in the following claims.

What I claim and desire to secure by Letters Patent is: 1

1. A space heater comprising, a vertically disposed tubular casing having an open lower end, means adapted to support the casing with the lower end spaced from a, supporting surface, a cup-shaped fire pot having an impervious annular bottom wall and a generally cylindrical side wall, an annular flange joining the top of the cylindrical wall to said casing and supporting the fire pot within the lower end of the casing, said flange having spaced apertures therethrough, a vertically disposed tube within said casing extending into the fire pot providing an annular space between the periphery; of the tube and the cylindrical wall of the fire pot, said tube being joined to the bottom wall of the fire pot, a fan within said tube for forcing air downwardly thereof in the region of the fire pot, and means for supplying fuel into the fire pot adjacent the bottom wall thereof.

3. In a space heater, a vertically disposed tubular casing having an open lower end, means adapted to support the casing with the lower end above a supporting surface, a fire pot having an impervious annular bottomwall and generally cylindrical side wall provided with a plurality of apertures, a flange joining the top of the cylindrical wall to said casing and supporting the fire pot within the lower end of the casing, a vertically disposed tube in said casing extending into the fire pot, said tube being rigidly joined to the bottom wall of the fire pot; a fan within said tube for forcing air downwardly therethrough, an adjustable damper mechanism adjacent the lower end of said tube for controlling the volume of air moving downwardly from said tube, means closing the top of the casing around said tube, and said tube having a plurality of apertures through the wall thereof in the region of the fire pot.

4. In a space heater, vertically disposed tubular casing having an open lower end, mean's'adapted to support the casing with the lower end above a supporting surface, a fire pot having animpervious annular'bottom wall and a generally cylindrical'side wall provided with plurality 'of apertures, means joining the top of the cylindrical wall to said casing and supporting the fire pot "within the lower end of the casing, a vertically disposed tube in said casing extending into the fire pot -rigidly joined to the bottom wall of the fire pot, means for forcing air downwardly in said tube, a damper mechanism adjacent the lower end of said tube controlling the flow of air downwardly from said tube, means closing the top of the casing around said'tub'e, and said tube having 'a plurality of apertures through the wall thereof adjacent the fire pct.

therethrough, a damper mechanism at the lower end of said tube adjacent the bottom wall of the fire pot for controlling the passage of air downwardly from said tube, means closing the top of the casing around said tube, said tube having a plurality of apertures through the Wall thereof 5. A-- space heater comprising, a vertically disposed tubular-c'asing having an open lower'end; means adapted to support the casing with' the lower end spaced from a supporting surface a cup-shaped fire pot having an impervious annular bo'ttom wall-and a generally cylindrical side wallprovided with a plurality of spaced apertures;'1anannular fiange joining the top of the cylindricalwall to said casing and supporting the fire pot within the lower end of the casing, said flange having spaced apertures therethrough,-a vertically :disposed tube within said casing :extending. into the fire pot providing an annularspace-between the periphery of the tube and the,

cylindrical wall ofthe fire pot, said tube being joined to the bottom wall of the fire pot, 'a fan within said tube for forcing air downwardly therein, a damper mechanism at the'lower' end of said tube adjacent the bottom wall of the fire pot for controlling the passage of air downwardly from the tube, means closing the top of the easing around said tube, said tube having a plurality of apertures through the wall thereof within the fire pot, a plurality of tubes arranged radially Within the lower end of the first tube for discharging fuel into the fire pot, and an annular baffle supported on said flange and surrounding the tube in spaced relationship.

REUBIN' E. MAYO.

REFERENCES CITED UNITED STATES PATENTS Number The following references are of record in the 15 N be file of this patent: 

